Method for the manufacture of containers



METHOD FOR THE MANUFACTURE OF CONTAINERS Filed Opt, 20, 1937 INVENTORATTOR Patented Nov. 5, i940 I g "UNITED sTATEs PATENT o ncE METHOD FORTHE MANUFAGTUREQOF commas Harry F. Waters, New York, N Y.

Application October 20, 1937, Serial No. 169,942 4 Claims. (Cl. 93-35) iThis invention relates to the manufacture of adhesive I is applied tothe web .of material bags, boxes or similar containers andmorepardesignated generally by the letter A along one ticularly to animproved bag or container which is marginal edge of the web and asimilar line of fluid and liquid tight. More particularly my inadhesivel l is applied to the other marginal edge vention relates to an improvedmethod for the of the web. Bands of adhesive I! are applied tomanufacture of bags and similar container in the web at spaced intervalsand connect the marwhich the material from which the bag or conginallines of adhesive l0 and II. These bands taineris made is preprinted insuch a manner of adhesive are substantially twice the width of that theseams and joints thereof will be liquid the bands of adhesive l0 and Hsince when the m and fluid tight. web is cut into baglengths across theweb along One difiiculty in forming a fluid or a fluid and the dottedlines l3; each blank will be provided liquid-tight bag is that it hasheretofore been with longitudinal lines of adhesive l0 and II impossibleto form the seams and joints thereof running along the margins of theweb and lines fluid and liquid tight. Attempts have been made ofadhesive 14 and 15 extending across the blank with some measure ofsuccess to form a liquidat the end edges thereof. Each bag blank will be15 tight bottom, but unless the bag itself throughout provided withlines of adhesive substantially is liquid and fluid tight, the formationof a fluid square or rectangular in.out1ine. and liquid-tight bottombecomes of little avail. The blank or web of material during its pas-The failure to construct a satisfactory fluid and sage through the tubeforming mechanism of a. o liquid-tight container has in a large partbeen conventional bag machine is folded so as to procaused bythe'methods employed in forming the vide a front wall l6, reentrantfolds l1 and I8 seams of the bag as the material from which the forminggussets of the bag and arear wall formed bag is constructed is convertedinto bag form. by-sections l9 and 20 of the blank. In accord-Accordingly one of the chief objects of this ance with standard bagmaking practices the tube 5 invention is to provide an improved methodof is formed by overlapping the longitudinal marpreprinting on thematerial from which the bag ginal edges of the web. However, in accordismade. Predetermined lines of adhesive are ance with my present inventionthe marginal applied prior to bag formation which, when edges of the webare not overlappei'but on the brought into operative relation, willresult in the contrary the blank is so formed into a tube as toformation of liquid and fluid-tight seams. Other bring the marginallines of adhesive l0 and ll objects of this invention will become moreapinto contact with each other. If the adhesive parent from a reading.of the following speciflcaernployed be non-thermoplastic in nature; thetion taken in connection with the attached drawseam formed by bringingthe lines of adhesive ing in which like numerals indicate like partsinto contact is secured in a conventional manner,

Fig. 1 is a top plan view of a section of a web If,however,the adhesiveemployed be of athermoof material from which bags may be formedshowplastic nature, heat and pressure will be applied ing the manner inwhich the lines of adhesive are to the contacting lines of adhesive soas to cause preprinted thereon; I I afiow and a consequent adhesion ofthe two lines Fig. 2 is a detailed view of a bag blank prior ofadhesive. I to its formation into a tube and showing the in- The bottomof the bag is readily formed by apvention as applied to the constructionof a plying, if a thermoplastic adhesive be used heat, 81188815811 ndand pressure to'the band of adhesive l2 before Fig. 3 is an end view ofa bag made in accordthe webis severed into, bag lengths and an inancewith the present invention after the end spection of Fig. 3 showing thesealed end of the has b n l bag will reveal the fact that there is acontinuous Referring now to the drawing and more parseal formed by theline of adhesive. 15 which ticularly to Fig. 1, there is shown themanner in extends throughout the end of the bag and since which thematerial of the bag may be preprinted. the longitudinal seam 2| isformed by bringin and in-which namely, by the use-of one or morepressure rolls. 35

Adhesive preferably, although not necessarily the lines of adhesive Illand II carried along the thermoplasticin nfature, is printed,. by meansof marginal edges of the blank, the band of adhesive suitable printingrolls to which adhesive is supalong the bottom of the bag is in effect acontinua plied in any known manner on one surface of ation of thelongitudinal seam 2| so that at no" the web of material from which thebags are to place in the bottom and longitudinal seam of the be formed.As will be noted a continuous line of bag is'there an absence ofadhesive. If, however, H

\ bag.

.in this case the adhesive -in character.

the longitudinal seam had been formed in a conventional seam, that is,by overlapping the marginal longitudinal edges of the web, there wouldbe no continuous line of adhesive from the bottom of the bag through andinto the longitudinal seamof the bag. After the bag has been formed andfilled with the desired material it may be readily sealed by adheringtogether the adhesive l4 carried in the blank along the top edgesthereof and being present in the bag throughout the inner periphery ofthe top of the bag. Again when the, walls and gussets within e top areaof the bag are secured together, ther will be present a continuous areaof adhesive extending through the closure of the bag into and throughthe longitudinal seam of the bag, and in and throughout the bottom ofthe The above method of constructing a bag becomes of even greaterimportance when a liquidproof material is used in forming the bag. Aswill also be liquid proof If as in the construction above describedthere is a continuous band of adhesive joining the top closure andbottom of the bag, it

follows that a liquid and fluid-type bag is formed 4 because if thelongitudinal seam were formed by Y overlapping the marginal edges of theweb of material, the liquid-proof coating of the material would not bein contact throughout the seam and the danger of leakage through theseam either through wicking or great.

It will be appreciated by those skilled in the art that the principlesof my present invention may be employed in the manufacture of all typesof bags whether of the fiat, square or automatic opening type. Manymodifications and variations in construction and arrangement may be madewithout in any way departing from the spirit or scope of my presentinvention, as defined in the appended claims which are to be broadly,construed. I claim:

. 1. In a method .for the manufacture of bags and the like, the stepswhich comprise printing a band of liquidproof adhesive along each of thelongitudinal marginal edges of a single side of a web of liquidproof,flexible material and of adhesive into face to face other bands ofliquidproof adhesive in spaced re-- lation transversely of the same sideof said web, folding the web to bring the first named bands contact,forming a bondtherebetween, thereby forming a tube, and so severing saidtube as to provide a plurality of bag blanks open at their en and havinga continuous band'of adhesive located at one of said ends.

2. In a method for the manufacture of bags ineffective sealing would beand the like, the steps which comprise printing a band of liquidproofadhesive along each of the longitudinal marginal edges of a single sideof a web of liquidproof, flexible material and other bands ofliquidproof adhesive in spaced relation transversely of the same side ofsaid web, folding the web to bring the first named bands of adhesiveinto face to face contact, forming a bond therebetween, thereby forminga tube, and severing said tube through each of said transverse bands'ofadhesive to provide a plurality of open ended bag blanks carrying bandsof adhesive adjacent their open ends and on the inner periphery thereof.

3. In a method for the manufacture of bags and the like, the steps whichcomprise printing a band of liquidproof adhesive along each of thelongitudinal marginal edges of a single side of a web of liquidproof,flexible material and other bands of liquidproof adhesive in spacedrelation transversely of the same side of said web, folding the web. tobring the first named bands of adhesive into face to face contact,forming a. bond therebetween, thereby forming a tube, severing said tubethrough eachof said transverse bands of adhesive to provide a pluralityof open ended bag blanks carrying bands of adhesive adjacent their openends and on the inner periphery thereof, and thereafter bonding theadhesive at one of the open ends of each blank to form a bag.

4. In a method for the manufacture of bags 'the steps which comprise:providing a continuous web of flexible fluidproof material;

a-single side thereof by applying thereto uous bands of fluidproofadhesive along the longitudinal edges of said single side and, atintervals, joining said longitudinal bands by lateral bands offluidproof adhesive to outline consecutive areas on the same singleside, each such treating contineach of area being bordered by theaforesaid longitudinal bands of'adhesive and bands of adhesive; foldingsaid web so as to bring ,the longitudinal bands of adhesiveinto mutuallycontacting relation and causing adhesion between said bands to form alongitudinally sealed but transversely open, continuous tube havingsaidlateral bands of adhesive on the inner surface thereof; formingtubular blanks by severing said continuous tube along lines so locatedas to leave a portion, at least, of each transverse band of adhesive oneach side of such line; and closing one end of each blank by treatingthe same, in the area of that portion of the transverse band remainingat such end of such blank, to cause the adhesive material of transverseband to form the blank.

a seal transversely of HARRY F. WATERS.

said portion of said 40 by a pair of said lateral

